4 members, 2 fail, the cluster stops. Why wasn't 4 safer than 3?
You'll learn to
compute quorum and pick an odd member count
Recap
- 1Writes need a majority: quorum = ⌊N/2⌋ + 1
- 23 → 1 failure, 5 → 2, 7 → 3
- 3Even counts add cost, not safety
Check yourself
A five-member etcd cluster: how many members can fail before it loses quorum?
9.4
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